Refactored public/common packages into common_dft.

docs/dev/parser_tutorial.md

gui/src/components/archive/MetainfoBrowser.js

nomad/archive.py

nomad/cli/dev.py

nomad/datamodel/datamodel.py

nomad/datamodel/dft.py

nomad/datamodel/encyclopedia.py

nomad/datamodel/metainfo/__init__.py

nomad/datamodel/metainfo/common.py

nomad/datamodel/metainfo/common_dft.py

nomad/datamodel/metainfo/common_experimental.py

nomad/datamodel/metainfo/common_old.py

nomad/datamodel/metainfo/common_qcms.py

nomad/datamodel/metainfo/general.py

nomad/datamodel/metainfo/public.py

nomad/datamodel/metainfo/public_old.py

nomad/metainfo/generate.py

nomad/metainfo/legacy.py

nomad/metainfo/metainfo.py

nomad/metainfo/templates/package.j2